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Title: Risk Assessment of Structural Integrity of Transportation Casks after Extended Storage

Abstract

This study assessed the risk of loss of structural integrity of transportation casks and fuel cladding after extended storage. Although it is known that fuel rods discharged from NPPs have a small percentage of rod cladding defects, the behavior of fuel cladding and the structural elements of assemblies during transportation after long-term storage is not well understood. If the fuel degrades during extended storage, it could be susceptible to damage from vibration and impact loads during transport operations, releasing fission-product gases into the canister or the cask interior (NWTRB 2010). Degradation of cladding may occur due to mechanisms associated with hydrogen embrittlement, delayed hydride cracking, low temperature creep, and stress corrosion cracking (SCC) that may affect fuel cladding and canister components after extended storage of hundreds of years. Over extended periods at low temperatures, these mechanisms affect the ductility, strength, and fracture toughness of the fuel cladding, which becomes brittle. For transportation purposes, the fuel may be transferred from storage to shipping casks, or dual-purpose casks may be used for storage and transportation. Currently, most of the transportation casks will be the former case. A risk assessment evaluation is conducted based on results from experimental tests and simulations with advancedmore » numerical models. A novel contribution of this study is the evaluation of the combined effect of component aging and vibration/impact loads in transportation scenarios. The expected levels of deterioration will be obtained from previous and current studies on the effect of aging on fuel and cask components. The emphasis of the study is placed on the structural integrity of fuel cladding and canisters.« less

Authors:
 [1];  [2];  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1432452
Report Number(s):
13-5106
13-5106
DOE Contract Number:  
NE0000698
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Ibarra, Luis, Medina, Ricardo, and Yang, Haori. Risk Assessment of Structural Integrity of Transportation Casks after Extended Storage. United States: N. p., 2018. Web. doi:10.2172/1432452.
Ibarra, Luis, Medina, Ricardo, & Yang, Haori. Risk Assessment of Structural Integrity of Transportation Casks after Extended Storage. United States. doi:10.2172/1432452.
Ibarra, Luis, Medina, Ricardo, and Yang, Haori. Fri . "Risk Assessment of Structural Integrity of Transportation Casks after Extended Storage". United States. doi:10.2172/1432452. https://www.osti.gov/servlets/purl/1432452.
@article{osti_1432452,
title = {Risk Assessment of Structural Integrity of Transportation Casks after Extended Storage},
author = {Ibarra, Luis and Medina, Ricardo and Yang, Haori},
abstractNote = {This study assessed the risk of loss of structural integrity of transportation casks and fuel cladding after extended storage. Although it is known that fuel rods discharged from NPPs have a small percentage of rod cladding defects, the behavior of fuel cladding and the structural elements of assemblies during transportation after long-term storage is not well understood. If the fuel degrades during extended storage, it could be susceptible to damage from vibration and impact loads during transport operations, releasing fission-product gases into the canister or the cask interior (NWTRB 2010). Degradation of cladding may occur due to mechanisms associated with hydrogen embrittlement, delayed hydride cracking, low temperature creep, and stress corrosion cracking (SCC) that may affect fuel cladding and canister components after extended storage of hundreds of years. Over extended periods at low temperatures, these mechanisms affect the ductility, strength, and fracture toughness of the fuel cladding, which becomes brittle. For transportation purposes, the fuel may be transferred from storage to shipping casks, or dual-purpose casks may be used for storage and transportation. Currently, most of the transportation casks will be the former case. A risk assessment evaluation is conducted based on results from experimental tests and simulations with advanced numerical models. A novel contribution of this study is the evaluation of the combined effect of component aging and vibration/impact loads in transportation scenarios. The expected levels of deterioration will be obtained from previous and current studies on the effect of aging on fuel and cask components. The emphasis of the study is placed on the structural integrity of fuel cladding and canisters.},
doi = {10.2172/1432452},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}